Blank Peptides edges American Peptides on our transparency method (7.8 vs 7.6). Both are young US vendors with lot-number lookups, but Blank names its labs (Horizon Analytical and Freedom Diagnostics) on every certificate and pairs each current lot with an endotoxin report. American Peptides publishes a legal entity and has the larger lookup (126 lot-matched certificates), and it was cheaper on retatrutide when we checked. Neither has independent test data. American Peptides is #1 and Blank Peptides #4 in our editors' order, which isn't sorted by score.
Notice: Research peptides are sold for in-vitro laboratory research only. They are not FDA-approved, not for human or animal consumption, and this page is not medical advice. This comparison covers supplier transparency only, based on public documentation. We didn't purchase or test products.
Side-by-side
| Blank Peptides | American Peptides | |
|---|---|---|
| Transparency score (method) | 7.8 | 7.6 |
| Overall score | 7.8 | 9.1 |
| Entity and address | No entity; Sheridan, WY mailing address; ships from Texas | American Peptides LLC, Shreveport, LA; no street address |
| Domain registered | March 4, 2026 (site claims 2021) | February 21, 2026 |
| COA library | 232 certificates; purity + endotoxin per current lot | 126 lot-matched PDFs |
| Lot lookup | Yes, verify page | Yes, verify page |
| Lab named | Horizon Analytical, Freedom Diagnostics, on certificates | Bioviridian, on homepage only |
| Endotoxin reports | Yes, separate report per current lot | Claimed on homepage |
| Finnrick | No profile | Profile, 0 tests |
| Labeling issues | "Sexual Health" category | "Glow Up" bundle, "Brain-Fuel" strips |
| Free shipping | US orders over $200 | Orders over $300 |
| Payment | Cards, wire, crypto | Cards, ACH/wire, crypto |
| Returns | 14 days, unopened | All sales final |
| Coupon code | CHECKED, 10% off | None (20% sign-up offer) |
COAs and labs: Blank names the lab where it counts
Both vendors let you type a lot number and pull up its certificate, which is the most useful thing a vendor can offer. The difference is what's on the certificate.
Blank Peptides prints the lab on the report itself. The BPC-157 certificate we opened (lot DPS-4605515, August 22, 2026) is a Horizon Analytical UPLC-MS report showing 99.4% purity and 9.82 mg measured in a 10 mg vial, with a report number you can search on the lab's site. A separate endotoxin report for the same lot shows <0.05 EU/mL (review).
American Peptides says on its homepage that every batch is verified by Bioviridian, but its COA page and lookup don't name a lab, and the PDFs we opened weren't machine-readable (review). To rely on one of its certificates, you have to check it against Bioviridian's own search.
Blank's paperwork isn't spotless. It claims sterility testing on every lot, but we found no sterility report, and two CJC-1295 products share one lot number. See our COA guide for what to check.
Business transparency: American Peptides is clearer
American Peptides publishes its legal entity, city and phone number. Blank Peptides gives only a Sheridan, WY mailing address and no entity name, and it says it has been in business since 2021 although its domain was registered in March 2026. Neither publishes a street address for its operations.
Labeling
Both carry strict research-use terms. Blank goes further, saying it gives no dosing or protocol guidance, and it sells GLP-class compounds under their real names. American Peptides loses points for consumer-style names such as an "ASCEND Bundle - Metabolic + Glow Up Research Stack" and "Brain-Fuel" dissolving strips. Blank's weak spot is a "Sexual Health" shop category.
Price check
| Item | Blank Peptides (Oct 12, 2026) | American Peptides (Oct 7, 2026) |
|---|---|---|
| Retatrutide 10 mg | $115.00 | $89.25 with Subscribe & Save ($105 list) |
| BPC-157 | $65.00 (10 mg) | from $60 |
American Peptides is cheaper on retatrutide. Blank's CHECKED code (10% off) and bulk pricing narrow the gap on larger orders: BPC-157 drops to $48.75 a vial at 9+.
Shipping and returns
Blank processes orders within 1 business day, ships free in the US over $200 and accepts unopened returns within 14 days. American Peptides processes in 24-48 business hours, ships free over $300 and treats all sales as final.
Which should you choose?
- Choose Blank Peptides if you want the lab name and an endotoxin result on the certificate for your exact lot, and a return window. Use code CHECKED for 10% off. Visit Blank Peptides.
- Choose American Peptides if a published legal entity matters more to you, or for lower GLP-class prices. Visit American Peptides.
Either way, look up your lot and confirm the certificate with the lab directly. Neither has independent test data yet.